Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals

Details Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals

2011-08-15

arxiv.org/abs/1108.3066v1

Phys. Rev. Lett. 107, 186403 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.107.186403

We study double-exchange models with itinerant t2g electrons in spinel and pyrochlore crystals. In both cases the localized spins form a network of corner-sharing tetrahedra. We show that the strong directional dependence of t2g orbitals leads to unusual Fermi surfaces that induce spin superstructures and noncoplanar orderings for a weak coupling between itinerant electrons and localized spins. Implications of our results to ZnV2O4 and Cd2Os2O7 are also discussed.

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